Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 36 for “"Geometric modeling"”.
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Automatic geometric modeling of spatial mechanism links
… collection of subroutines which allow automatic geometric modeling of 3-D models for spatial links or linkages given a minimum amount of information as input. The subroutines utilize the CADCD (CADAM, Inc.) geometry interface software to enter 3-D data directly into the CAD/CAM database. …
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Geometric modeling and analysis of dynamic resource allocation mechanisms
… presented as a specific case of a more general modeling framework we put forth. The underlying question asks how to partition a given resource into a fixed number of parts such that the elements of the resulting partition can be scheduled among a set of user requests to minimize the worst case …
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Comprehensive geometric modeling of human cerebral vasculature for quantitative vascular analysis
… work we developed a comprehensive and structured geometric model of human cerebral vasculature for quantitative anatomical analysis. We first proposed a general and structured geometric representation of the interconnected vascular network as a framework. We then described an image processing …
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Geometric modeling and optimization in 3D solar cells : implementation and algorithms
… to maximize the total energy collected. On the modeling side, in order to calculate the energies generated from both direct and reflected sunlight, I store all the geometric inputs in a binary space partition tree; this data structure in turn efficiently supports a crucial polygon clipping …
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Geometric modeling of manufacturing processes variations for model-based tolerance analysis
… method available for the analysis of the product geometric variations. For the automation of the analysis procedure, the part tolerance information must be represented in a format suitable for computer interpretation. Previously proposed tolerance representation schemes have suffered either from …
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Feature-based geometric modeling using B-spline surfaces and a natural language approach
… a human being to interpret them and recognize geometric features to evaluate the design. Solid modeling systems have made the task somewhat easier, but they often require tedious and complex operations using simple geometric primitives. This has led to investigation of modeling systems which …
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The enhancement of PHIGS plus B-spline functionality for geometric modeling in CAD
… of such software requires the development of modeling tools for the creation of CAD geometry. This research investigates the capabilities of the proposed graphics standard, PHIGS plus, as a geometric modeling interface in CAD that off-loads many basic modeling functions to PHIGS. Specifically, …
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An object-oriented software development environment for geometric modeling in intelligent computer aided design
… issue in developing intelligent CAD systems for geometric modeling is the integration of the design geometry with the representation of the design constraints. Current commercial computer aided design (CAD) systems are used primarily for recording the results of the design process. Using …
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Adaptive Control of a Camera-Projection System using Vision-Based Feedback
… that are designed using commercially available geometric modeling software. The ideal or desired image sequences are subsequently rendered in the geometric modeling software using an ideal camera/projector pose and ideal intrinsic parameter camera model. The rendered imagery from the ideal …
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CADMADE, an approach towards a device-independent standard for CAD/CAM software development
… Although PHIGS+ promises to deliver some geometric modeling procedures, not nearly enough is being done to support the writing of CAD/CAM software. CAD/CAM applications programmers should have available a standardized high level applications programming environment which supports the …
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Computer-aided design of axial-flow fans
… basic geometry of an axial-flow fan blade. Next, geometric modeling techniques are used to model the curves and surfaces of the blade, thereby completing the geometric description of the blade. Finally, FAN3D uses the CADCD component of the CADAM (CADAM, Inc.) Geometry Interface to automatically …
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High-order adaptive methods for computing invariant manifolds of maps
… interpolation/approximation techniques from geometric modeling. He uses Bezier curves/triangles, fundamental objects in curve/surface design, to create adaptive methods. The methods are based on tolerance conditions derived from properties of Bezier curves/triangles. The author develops and …
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Interactive freeform solid modeling with haptic interface
… and addresses the issues of interactive solid modeling with haptic interface. A virtual reality (VR) approach is taken to make the use of modeling tools more intuitive and interactive. The virtual sculpting method is based on the metaphor of carving a solid block into a 3D freeform object. The …
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C++ software for computing and visualizing 2-D manifolds using Henderson's algorithm
… Physical Sciences. Today, computer graphics and geometric modeling are used routinely in science, engineering, business; and entertainment. In this thesis we develop object-oriented techniques and software for computing and visualizing implicitly defined manifolds ("surfaces") that arise a wide …
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Dynamic Multivariate Simplex Splines For Volume Representation And Modeling
<p>Volume representation and modeling of heterogeneous objects acquired from real world are very challenging research tasks and playing fundamental roles in many potential applications, e.g., volume reconstruction, volume simulation and volume registration. In order to accurately and efficiently …
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Strumenti e metodi per lo sviluppo prodotto di lenti oftalmiche
… In the design stage, the research addressed geometric modeling of complex lens shapes and relevant analysis tools for the optical-geometrical characterization of the produced models. In the manufacturing stage, the main interest was focused on the set-up of the fabrication process, …
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Syzygies and implicitization of tensor product surfaces
… map λ : P1 ×P1-->P3. These surfaces arise in geometric modeling and in this context it is useful to know the implicit equation of λ in P3. Currently, syzygies and Rees algebras provide the fastest and most versatile method to find implicit equations of parameterized surfaces. Knowing the …
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Comparative urban performance simulation
… 1992 to 2012. The predominate instrument for geometric modeling and simulation was the MIT Urban Modeling Interface(UMI). The methodology proposed in this study provides both, a specific framework of values for performance optimization in Providence as well as a more general framework for the …
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Structural elements with mathematically defined surfaces for enhanced structural and acoustic performance
… or weight. Initial analysis was performed using geometric modeling and finite element analysis. Experimental analysis involved both static and dynamic system identification. The experimental results indicate that quasi-isotropic designs can be accomplished with two-dimensional curvature.
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LumiModeling: A Gaussian Splatting-Based Tool for Recreating Dynamic Material and Lighting Interaction in Architecture
This thesis presents LumiModeling, a real-time visualization tool based on Gaussian Splatting (GS) that simulates the dynamic interplay between materiality and lighting in architectural environments. While conventional design workflows rely on geometric modeling and photorealistic rendering, they …
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